Lining material.



No. 694,522. Patented Mar. 4, |902.-

G. S. BIRD. nume-'MATERIAL K, (Applcntion led Fab. 18, 1901.) (No Model.)

if WM UNITED v STATES PATENT OFFICE.

'CHARLES SQBIRD, OF WALPOLE, MASSACHUSETTS.

LlNlNGlVlATERIAL.

SPECIFICATION forming part of Letters Patent No. 694,522, dated March 4, 1902.

v Application filed February 18, 1901. Serial No. 47,787. (No model.)

drawings, is a specification, like letters on the drawings representing like parts.

The present invention relates to lining material such as is commonly used for insulating refrigerators and the like, in which the insulation proper consists of a dead-air space between two walls, the lining being used for the purpose of excluding air and moisture from said dead-air spaces as far as possible. The material embodying the invention, however, may be used for other purposes. f

The invention is embodied in the materia for lining or other purposes of novel construction, the purpose being to make an inodorous material practically impervious to moisture and air and at the same time'durable, so that it will not readily deteriorate through decay, asis the case with ordinary paraffin and rosin sized papers which have sometimes been used for purposes analogous to those for which the material of the invention is intended. The material embodying the invention comprises two unsized layers of paper impregnated or saturated with a moisture -irepelling mate; rial-such as paraffin-wax, for instance-between Whieh is a continuous layer of waterproof substance, the layers beingintimately and firmly united. The said waterproof substance should be adhesive, and. a mixture a'sphaltic in nature may be used to advantage,

as it can be applied in a molten condition,-

and will to a certain extent permeate the paper and irmly adherethereto when it has solidied. In the manufacture of the material the Waterproof substance is introduced between the sheets of paper, so that it may readily enter the pores of the paper, and

when solidified'stick firmly the two layers. It is essential that the outer layers of paper should be made moisture and air proof by being saturated or impregnated with a moisturerepelling mixture like paraffin-Wax or a similar substance. So-called resin-sized or dry outer layers of paper would not answer.

The drawing is an exaggerated section of a sheet of lining embodying the invention.

The material embodying the invention comprises the two outer layers a. of unsized paper and an intermediate continuous layer b of asphalt or other suitable waterproof material.

The surface layers a are thoroughly saturated or impregnated 'withV moisturerepelling lmaterial, such as paraffin-wax, which prevents lthe paper part from deteriorating rapidly,

while the intermediate layer of Waterproof material, like asphalt, renders the finished material practicallywater and air proof.

Iclaim- 1. As an article of manufacture, lining material which consists of outer layers of unsized paper; an intermediate layer of insoluble waterproong material intimately uniting the inner surfaces of said outer layers and partially impregnating thepores thereof; and moisture-repelling material saturating the outer surfaces of the layers.

2. As an article of manufacture, lining material which consists of outer layers of unsized paper; an intermediate-layer of asphalt intimately uniting the inner surfaces of said outer layers and partially impregnating the pores thereof; and paraffin saturating said outer layers.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

. CHARLES S. BIRD.

Witnesses:

FLORENCE E. HOLMES, EDWIN S. MORSE. 

